Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

You need to remove two matchsticks to make the below equation true. Can you do it ?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

How could a baby fall out of a twenty-story building onto the ground and live?

A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?